Results 11 to 20 of about 2,667 (188)
Deformational sequence of inversion in the Paramirim Aulacogen, northern region of the intracontinental sector of the Araçuaí Orogen [PDF]
Brazilian Journal of Geology, 2023 The Paramirim Aulacogen was filled by the Espinhaço and São Francisco supergroups in the period from 1.75 to 0.69 Ga, and suffered partial inversion during the Ediacaran.
Caroline Novais Bitencourt +1 more
doaj +1 more source
Multi‐Layer Seismic Anisotropy Beneath Greenland
Geochemistry, Geophysics, Geosystems, 2021 Seismic anisotropy provides insight into past episodes of lithospheric deformation and the orientations of strain in the underlying asthenosphere. The Greenland mantle has played host to a rich history of tectonic processes, including multiple orogenies ...
Erica M. Nathan +3 more
doaj +1 more source
Геодинамика и тектонофизика, 2021 In modern concepts, the upper mantle of the Earth is a highly viscous incompressible liquid, and its flow is described using the Navier – Stokes equations in the Oberbeck – Boussinesq and geodynamic approximations.
V. V. Chervov +2 more
doaj +1 more source
Speculations on the formation of cratons and cratonic basins
Earth and Planetary Science Letters, 2016 Surface wave tomography using Rayleigh waves has shown that Tibet and the surrounding mountain ranges that are now being shortened are underlain by thick lithosphere, of simi-\ud lar thickness to that beneath cratons. Both their elevation and lithospheric thickness can result from pure shear shortening of normal thickness continental lithosphere by ...
McKenzie, D. P., Priestley, K. F.
openaire +2 more sources
Aulacogens, the Donets Basin (Eastern Ukraine, Southwestern Russia), and the new classification of rifts: Towards a proper terminology [PDF]
Geološki Anali Balkanskoga Poluostrva, 2012 Some intra-cratonic basins are traditionally called “aulacogens”. This term has persisted in the geoscience literature since its invention by Soviet geologists in the mid-20th century before the triumph of the plate tectonics, but its meaning ...
Ruban Dmitry A.
doaj +1 more source
Building Archean cratonic roots [PDF]
Frontiers in Earth Science, 2022 Geophysical, geochemical, and geological investigations have attributed the stable behaviour of Earth's continents to the presence of their Archean cratonic roots. These roots are likely composed of melt-depleted, low density residual peridotite with high Magnesium number (Mg#), while devolatilisation from the upper mantle during magmatic events might ...
Charitra Jain +6 more
openaire +5 more sources
Geochemistry, Geophysics, Geosystems, 2022 Coupled U‐Pb and trace‐element analyses of accessory phases in crustal xenoliths from the Late Devonian Udachnaya kimberlite (Siberian craton, Russia) are used to constrain Moho temperature and crustal heat production at the time of kimberlite eruption ...
Francisco E. Apen +6 more
doaj +1 more source
Deep continental roots and cratons [PDF]
Nature, 2021 The formation and preservation of cratons-the oldest parts of the continents, comprising over 60 per cent of the continental landmass-remains an enduring problem. Key to craton development is how and when the thick strong mantle roots that underlie these regions formed and evolved.
D. Graham Pearson +8 more
openaire +4 more sources
Convective Self‐Compression of Cratons and the Stabilization of Old Lithosphere
Geophysical Research Letters, 2023 Despite being exposed to convective stresses for much of the Earth's history, cratonic roots appear capable of resisting mantle shearing. This tectonic stability can be attributed to the neutral density and higher strength of cratons. However, the excess
Jyotirmoy Paul +3 more
doaj +1 more source
AGU Advances, 2023 Mid‐lithosphere discontinuities are seismic interfaces likely located within the lithospheric mantle of stable cratons, which typically represent velocities decreasing with depth.
Tianze Liu, Emily J. Chin, Peter Shearer
doaj +1 more source